Resilient pulley



April 9, 1940. 1 H CHANSON 2,96,923

RESILIENT PULLEY Filed Ooi. 5, 1938 xNvNToR QHN ALJ H SON BY Y LT NEY Psa-nea Apr. 9, 1940 PATENT oFFlclsl 2,196,9zs nEsmEN'r PULLEY John H. Johanson, Cleveland, Ohio, assignor to The Cleveland Heater Company, Cleveland,

Ohio, a corporation of Ohio Application October 3, 1938, Serial No. 232,973

5 Claims.

'I'his invention relates to pulleys or like machine elements and refers more particularly to improvements in V-type pulleys having certain resilience in their belt engaging surfaces.

An object. of the invention is to provide a simple, eiiicient V-type resilient pulley which is composed of few parts and relatively inexpensive to manufacture.

In its simplest form the present novel pulley comprises a mounting hub and yieldabie side members forming the V-shaped. belt engaging pulley groove, together with resilient connecting means for securing the side members to the hub.

To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims; the annexed drawing and the following description setting forth in detail certain mechanism embodying the invention, such disclosed means constituting,

however, but one of the various mechanical forms in which the principle of the invention may be used.

In said annexed drawing:

Fig, 1 is a side elongated view, partially broken away, of the novel pulley hereof, and

Fig. 2 is a cross-sectional view taken on line 2'2 of Fig. l.

In the illustrated embodiment of the invention in said drawing the center or hub portion It has a bearing hole Ii therethrough by means of which the pulley may be suitably mounted upon a shaft or other rotating element indicated at l2.

The exterior of hub I0 is provided with means for carrying a pair of side members I8, which latter have opposed inclined surfaces it constituting the driving or friction surfaces conven-z tional to the present type device. At I5 there is indicated in dotted lines a regular V-belt engaged in the V-shaped driving recess of the pulley.

In accord with the principle of the invention, the side members are made of sheet metal sufflciently light in gauge to afford a certain resiliency in their engagement with a belt I5. By this construction it has been found that the driving engagement between the improved pulley and belt is considerably improved over the usual rigid pulley, and also that such novel construction tends to absorb the shock of sudden strains or accelerations of the pulley or belt.

As seen best in Fig. 2, the outer circumferential edge of each member I3 is rolled upon itself to lprovide a smooth curved contour as at I6, which as will readily be apparent eliminates any chance of the pulley sides digging into the belt (Cl. 'I4-230.1)

should the latter for any reason ride directly upon these edges. 'Ihe rollededges I6 also tend to strengthen the sides i3 and permit the use of relatively light gauge material.

The hub It, as mentioned above, is provided 5 with exterior means for securing the side members in place. Preferably 'this means comprises a ring-like element i8 of rubber firmly seated in an annular recess i9 of the hub between shoulders 20. The rubber ring I8 is comparatively 10.

thick and as shown in Fig. 2 the inner ends of side members i3 are anchored therein. Each member i3 has its inner peripheral edge contiguous with the inclined surface It formed with a radial short ange portion 2i and a right u angularly bent lateral ange 22. These portions 2 and 22 are received and secured in corresponding relieved portions of the ring I8. As in the case of edge i3, the iiange 22 adds' strength to the side member structure. In addition this Q0 ange 22 acts to prevent separation of the side member from its rubber mounting and at the same time permit the full play of resiliency in the working of the said member under the frictional strain of belt i5. 25

The assembly just described may be formed in any desired manner, one very efficient one being to vulcanize the rubber ring it in place in recess is and about fianges tl and 22. A pulley so made will be found very durable in use. 30

From the foregoing it will be seen that the present invention provides a novel pulley which has material advantages over all other known pulleys of like type. The improved pulley has been proven to aiord an elcient means for coupling a V-belt to s. rotating shaft, and one which is not only quiet in operation but through its resilient construction in the sheet metal sides and rubber mounting to reduce the wear upon the V-bclt. 40

It has also been found that the present novel pulley is quite effective in eliminating various noises encountered in V-belt driving mechanism, for example such noises as the friction between the belt and the pulley surfaces and the hum of 45 the motor carrying the pulley. A particular use of V-belts and the instant type pulley is in air conditioning apparatus wherein it is quite essential that as much of the noise as is possible be eliminated.

It will also be apparent from an understanding of the details of the invention described above that the side members I3 may be made in .one piece rather than in the two separate pieces as shown. With such construction the interme- 66 diatefconnecting portion oi' an integral sheet ners of providing tabs and like elements insliee't,v

metal work.

I claim:

1. A pulley of the character described comprising a hub, resilient material on the outside oi"v said hub, and side members carried solely by said material and without auxiliary attachment means in opposed relation an'd forming a V- shaped pulley groove about said hub.

2. A pulley of the character described comprise ing a hub, an annular layer of resilientmaterial on the hub exterior, side members having their inner peripheries embedded in said resilient ma-v prising a hub having an annular recess in its outer surface, a relatively thick layer of resilient material secured in said recess, and sheet metal side members having their inner edges anchored in said resilient material and having opposed inclined surfaces projecting beyond said resilient material and forming therebetween a substantially V-shaped groove. I

axis, and opposed inclined surfaces on said side members extending beyond said resilient material and forming therebetween a. substantially V-shaped groove. v

. 5. A pulley 'of the'character described com- `members carried by said resilient material, the

inner peripheral portions of said vdisk being anchored in said resilient material and -the outer peripheral portions of said disk being inclined in opposed relation -to provide a substantially v-shaped groove therebetween.

JOHN n. JonANsN. 

